Remove leak of objects between isolated worlds on custom events.

Source/bindings/v8/custom/V8CustomEventCustom.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/page/Frame.h"
 #include "RuntimeEnabledFeatures.h"
 
 namespace WebCore {
 
 void V8CustomEvent::detailAttrGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     CustomEvent* imp = V8CustomEvent::toNative(info.Holder());
+    ASSERT(!imp->serializedScriptValue().get());
     RefPtr<SerializedScriptValue> serialized = imp->serializedScriptValue();
     if (serialized) {
         v8::Handle<v8::Value> value = info.Holder()->GetHiddenValue(V8HiddenPropertyName::detail());
         if (value.IsEmpty()) {
             value = serialized->deserialize();
             info.Holder()->SetHiddenValue(V8HiddenPropertyName::detail(), value);
         }
         v8SetReturnValue(info, value);
         return;
     }
-    v8SetReturnValue(info, imp->detail().v8Value());
+    v8SetReturnValue(info, info.Holder()->GetHiddenValue(V8HiddenPropertyName::detail()));
+}
+
+void V8CustomEvent::initCustomEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
+{
+    CustomEvent* event = V8CustomEvent::toNative(args.Holder());
+    String typeArg = toWebCoreString(args[0]);
+    bool canBubbleArg = args[1]->BooleanValue();
+    bool cancelableArg = args[2]->BooleanValue();
+    v8::Handle<v8::Value> detailsArg = args[3];
+
+    args.Holder()->SetHiddenValue(V8HiddenPropertyName::detail(), detailsArg);
+    event->initEvent(typeArg, canBubbleArg, cancelableArg);
 }
 
 } // namespace WebCore